notes
Things worth writing down.
Longer looks at how the things I build actually work. Occasional, not scheduled. There's an RSS feed if that's your thing.
jul 27, 2026 · 6 min read
My recommender scored 84% and still gave bad answers
A two-tower model that looked good on every offline metric fell apart on the exact query real visitors typed. What the evaluation missed, and what it cost to fix.
read it →jul 26, 2026 · 3 min read
waze, but for when the artist actually comes out
A parked idea: crowdsourced stage times and live setlists at concerts, and why it belongs to Ticketmaster instead of me.
read it →jul 17, 2026 · 2 min read
How this site is built, and who builds it
The stack, the design rules, the test suite that guards the truth, and the honest role AI agents play in maintaining it.
read it →jul 17, 2026 · 4 min read
My marathon coach is a chat window
How I built a training system where an LLM writes the plans, a pipeline computes the numbers, and code keeps everyone honest.
read it →